Wouldn't checking in on a AY codeshare be done under AY rules? So still no checking to final.
And if checked in with AA rules, from what a very quick search tells me, no:
4.What if I have separate tickets in separate PNRs for itineraries with American to a oneworldairline?
When there are separate tickets issued in separate PNR’s, customer’s baggage will be checked to the final destination of the American 001 ticket. The customer is responsible for the baggage fees associated on the second ticket when the baggage is re-checked with the oneworld airline. This may involve exiting the secure area to claim and re-check the baggage. International flights may require clearing customs and rechecking on the other airline to the final destination.
AA checks to the end of 001-ticket, but at JFK you wouldn't start on a 001-ticket, so ..?
Read all here.